360 short block suppliers??
Terry, maybe I'm not calling it the same thing..Heres a couple of pics. The first is a Milodon performance valve. There is no "edge" above the 45* angle seat they machine onto the valve head. I call this a "factory" back cut valve. The ones I use are identical (from what I can see) to the Mancini Racing name brand, the pics are on their website too. An offshore manufactured Stainless performance valve, swirl polished head, and single 45* cut seat angle, single groove lock. The Milodons are just too much $$ for my needs right now.
The second is a Sealed Power stock 305 Chevy valve off the Summit website. You can see the 45* seat angle is wider (mider margin)and the back of the head is rough "as cast" finish, leaving that "lip" around the circumference of the top of the seat. A back cut to me, has always meant removing any remnance of that lip. I've never brought it right to the edge of the seat tho. Once the valves are "tapped in" (they dont need lapping when the Serdi does it) and the real seat margin can be seen. You then bring the 30* cut out to that margine? I havent, but I'm willing to try...lol.
Terry, maybe I'm not calling it the same thing..Heres a couple of pics. The first is a Milodon performance valve. There is no "edge" above the 45* angle seat they machine onto the valve head. I call this a "factory" back cut valve. The ones I use are identical (from what I can see) to the Mancini Racing name brand, the pics are on their website too. An offshore manufactured Stainless performance valve, swirl polished head, and single 45* cut seat angle, single groove lock. The Milodons are just too much $$ for my needs right now.
The second is a Sealed Power stock 305 Chevy valve off the Summit website. You can see the 45* seat angle is wider (mider margin)and the back of the head is rough "as cast" finish, leaving that "lip" around the circumference of the top of the seat. A back cut to me, has always meant removing any remnance of that lip. I've never brought it right to the edge of the seat tho. Once the valves are "tapped in" (they dont need lapping when the Serdi does it) and the real seat margin can be seen. You then bring the 30* cut out to that margine? I havent, but I'm willing to try...lol.